all these changes

backend/node_modules/passport/lib/errors/authenticationerror.js

@@ -0,0 +1,20 @@
+/**
+ * `AuthenticationError` error.
+ *
+ * @constructor
+ * @api private
+ */
+function AuthenticationError(message, status) {
+  Error.call(this);
+  Error.captureStackTrace(this, arguments.callee);
+  this.name = 'AuthenticationError';
+  this.message = message;
+  this.status = status || 401;
+}
+
+// Inherit from `Error`.
+AuthenticationError.prototype.__proto__ = Error.prototype;
+
+
+// Expose constructor.
+module.exports = AuthenticationError;